Automatic purifier for swimming-pools.



I. C. VV. GRETH.

AUTOMATIC PURIFIER FOR SWIMMING FOOLS.

APPLICATION FILED FEB. 24, ISI 5.

Paened June 22, 1915.

INVEMTOR I I l 'JOHN C. W. GRETH, 0F PITTSBURGH, PENNSYLVANIA. 'y

. AUTOMATIC rumrrnn non, 'sWImmINGrooLs To all whom it may concern.'

Be it known that I, J oHN C. W. GRETH, a citizen of the United States, residing at Pittsburgh, in the State of Pennsylvania, have invented a certain new and useful Automatic .Purifier for Swimming-Pools, of which the following is a specicationf My invention relates generally-to swimming pools, and its more particular object is to continually purify the water therein by j means `whichfare in effect automatic. That l. is, I propose to drawv olf the upper parts of opening, 4, located a shortdistance above into the pool.

the water by utilizing the phenomena of rise of level when swimmersare in the pool, and of the splashing and forming ofl Waves by their movements, and utilize this rise of level to carry the water through the filter and return it to the pool automatically.

I have illustrated the invention in the accompanying drawing, in which Figure l isa longitudinal section and partial side elevation of. the pool `and the attached apparatus; and Fig. 2 is a partial side view indicating a modification of .the arrangement, using a pressure filter. At some point, and preferably at the dee end of the tank 3, I provide by an overow the normal level W of the water in the pool,

which is kept constant by means of an aux'- iliary chamber 5, a oat 6, and a regulating valve 7 in the main inlet pipe 8. At this overliow port I provide a` trough 9 which) leads by any convenient'piping 10 into a 'tank 11 V'containing filtering material 12. And from the' bottom of the filter 12 Ilead the` pipe 13 back to a submerged inlet 14 This may conveniently be joined with'the it is usually advisable 'to insert a heater -15 as shown.

l Asshown 1n Fig. 2 the pipelO". is led into' the top of a pressure filter. 16,` and thence'.

returned Iby pipe 17 as before. The particular form of the lter is not material' to the invention. However, Ait will be observed that when swimmers jump into vthe poolthe level W will be raised and inevitably waves will be formed, which will carry` over-"the top strataof water into the'trough 9, theref withI the additional advantage,

main water inlet 8, andy alsov Specication of Letters Patent. 'Patenfedaune 22, 1915, i Application filed February 24, 1915. Serial N o. 10,178.

b raising the level of water in the filter 12 i proportional to the amount of use of it. Of

course it will be understood that the head o f water in thelilter 12 or trough 9 is sufficient to carry the Water through either the gravity filterv or the pressure filter to the other end `'of the U-tube 13, so that water will continually circulate and be puried,

in the particular form ofapparatus shown, that it may be Ycontinually heated and kept at proper temperature while in use.

The advantages of the device will readily .appear to those familiar with the art.

Having thus described my invention and illustrated its use, I claim the following:

1. The methodbf continually purifying the waterof a swimming pool which consists in maintaining a normal fixed level,

`raising' part of the water above said level by the immersion of )swimmers therein, filtering the water by gravity, and leading it' back into the pool, substantially as described. y 1

2. Apparatus for purifying the water of swimming. 001s-,v comprising theI provision v of an over ow receptacle-placed above the y normal level of the water 'in the pool, and a filter and' gravity return tube\ connecting with the pool, substantially as described.

3. A swimming pool provided with a main water inlet, an automaticv device to maintain a fixed level in the pool, an overflow chamber arranged just above said normal level, a lilter connected with said overflow, and a return pipe leading back into the pool and containing a heater therein.

i In testimony` whereof I have hereuntosigned my name inthe presence of two subscribed witnesses. p i JOHN c. w. GRETH.

. Witnesses: A i l Lorne P. Smm,

D. N. RANDOLPH. 

